import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sca = new Scanner(System.in);
        while(sca.hasNextLine()){
            String str1 = sca.nextLine();
            String str2 = str1.toLowerCase();
            char ch = str2.charAt(0);
            System.out.println(ch);
        }
    }
}
